Montana earthquakes

M1.8 earthquake 29 km S of Mammoth, Wyoming

A magnitude 1.8 earthquake struck 29 km S of Mammoth, Wyoming on Sun, Oct 24, 2021, 8:24 PM MDT (02:24 UTC), 5 km (3 mi) below the surface.

A larger quake followed: M2.6 35 km S of Silver Gate, Montana. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.8 (ML, local (Richter)), micro
Magnitude from
University of Utah Seismograph Stations
Local time
UTC
2021-10-25 02:24:56 UTC
Depth
4.7 km (2.9 mi), shallow
Epicenter
44.716° N, 110.675° W
Region
Montana
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.4 km horizontally, 0.3 km in depth
Magnitude uncertainty
±0.60
Depth from
From location
Station coverage gap
148°
Stations used
18

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 33 in the 60 days after this one and 41 in the 30 days before it.

After

  1. 1.7Wyoming · 1806 days ago · 4 km deep · 0 km away
  2. 2.128 km S of Mammoth, Wyoming · 1806 days ago · 5 km deep · 0 km away
  3. 1.946 km NE of Alta, Wyoming · 1804 days ago · 10 km deep · 71 km away
  4. 1.937 km S of Silver Gate, Montana · 1803 days ago · 13 km deep · 51 km away
  5. 1.637 km S of Silver Gate, Montana · 1803 days ago · 14 km deep · 50 km away
  6. 2.336 km S of Silver Gate, Montana · 1802 days ago · 13 km deep · 51 km away
  7. 2.028 km S of Mammoth, Wyoming · 1798 days ago · 5 km deep · 1 km away
  8. 1.727 km S of Mammoth, Wyoming · 1798 days ago · 5 km deep · 1 km away
  9. 1.728 km S of Mammoth, Wyoming · 1798 days ago · 4 km deep · 1 km away
  10. 1.544 km SE of West Yellowstone, Montana · 1797 days ago · 4 km deep · 36 km away
  11. 1.927 km S of Mammoth, Wyoming · 1793 days ago · 4 km deep · 2 km away
  12. 2.321 km ENE of Hebgen Lake Estates, Montana · 1790 days ago · 8 km deep · 27 km away
  13. 1.526 km W of Hebgen Lake Estates, Montana · 1790 days ago · 13 km deep · 68 km away
  14. 1.621 km ENE of Hebgen Lake Estates, Montana · 1790 days ago · 7 km deep · 26 km away
  15. 2.546 km NE of Alta, Wyoming · 1789 days ago · 10 km deep · 70 km away · felt by 1
  16. 2.246 km NE of Alta, Wyoming · 1789 days ago · 7 km deep · 71 km away
  17. 1.540 km SSE of West Yellowstone, Montana · 1788 days ago · 2 km deep · 43 km away
  18. 1.6Wyoming · 1788 days ago · 9 km deep · 43 km away
  19. 1.727 km S of Mammoth, Wyoming · 1787 days ago · 4 km deep · 2 km away
  20. 1.846 km NE of Alta, Wyoming · 1786 days ago · 10 km deep · 71 km away
  21. 1.950 km SSE of Mammoth, Wyoming · 1783 days ago · 2 km deep · 27 km away
  22. 1.928 km S of Mammoth, Wyoming · 1778 days ago · 4 km deep · 0 km away
  23. 1.829 km S of Mammoth, Wyoming · 1777 days ago · 5 km deep · 0 km away
  24. 1.830 km ESE of West Yellowstone, Montana · 1773 days ago · 8 km deep · 14 km away
  25. 1.939 km ESE of West Yellowstone, Montana · 1772 days ago · 7 km deep · 17 km away
  26. 2.419 km NE of West Yellowstone, Montana · 1771 days ago · 8 km deep · 22 km away
  27. 1.946 km ESE of West Yellowstone, Montana · 1770 days ago · 7 km deep · 22 km away
  28. 1.922 km SSW of Mammoth, Wyoming · 1768 days ago · 4 km deep · 12 km away
  29. 1.619 km ENE of West Yellowstone, Montana · 1764 days ago · 8 km deep · 17 km away
  30. 1.7Wyoming · 1763 days ago · 13 km deep · 53 km away
  31. 1.828 km S of Mammoth, Wyoming · 1760 days ago · 4 km deep · 1 km away
  32. 2.635 km S of Silver Gate, Montana · 1751 days ago · 15 km deep · 53 km away
  33. 1.523 km W of Hebgen Lake Estates, Montana · 1748 days ago · 11 km deep · 65 km away

Before

  1. 1.629 km S of Mammoth, Wyoming · 1806 days ago · 5 km deep · 0 km away
  2. 1.631 km ESE of West Yellowstone, Montana · 1806 days ago · 7 km deep · 16 km away
  3. 1.632 km ESE of West Yellowstone, Montana · 1806 days ago · 6 km deep · 16 km away
  4. 1.922 km S of Mammoth, Wyoming · 1806 days ago · 4 km deep · 7 km away
  5. 1.751 km SE of West Yellowstone, Montana · 1810 days ago · 4 km deep · 42 km away
  6. 1.938 km WNW of Hebgen Lake Estates, Montana · 1811 days ago · 10 km deep · 79 km away
  7. 1.647 km ESE of West Yellowstone, Montana · 1812 days ago · 5 km deep · 26 km away
  8. 1.647 km W of Cody, Wyoming · 1813 days ago · 9 km deep · 83 km away
  9. 1.666 km ESE of West Yellowstone, Montana · 1816 days ago · 7 km deep · 42 km away
  10. 1.665 km ESE of West Yellowstone, Montana · 1816 days ago · 7 km deep · 42 km away
  11. 1.528 km E of West Yellowstone, Montana · 1820 days ago · 8 km deep · 9 km away
  12. 1.528 km E of West Yellowstone, Montana · 1820 days ago · 8 km deep · 9 km away
  13. 1.760 km SE of West Yellowstone, Montana · 1821 days ago · 4 km deep · 45 km away
  14. 1.523 km SSE of Mammoth, Wyoming · 1825 days ago · 4 km deep · 7 km away
  15. 1.625 km SSE of Mammoth, Wyoming · 1825 days ago · 5 km deep · 5 km away
  16. 1.524 km SSE of Mammoth, Wyoming · 1825 days ago · 5 km deep · 6 km away
  17. 1.524 km SSE of Mammoth, Wyoming · 1825 days ago · 2 km deep · 6 km away
  18. 2.625 km SSE of Mammoth, Wyoming · 1826 days ago · 5 km deep · 6 km away
  19. 1.623 km SSE of Mammoth, Wyoming · 1826 days ago · 2 km deep · 7 km away
  20. 1.625 km SSE of Mammoth, Wyoming · 1826 days ago · 4 km deep · 5 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uu60464592. Read Sun, Oct 4, 2026, 3:18 PM UTC.